647068240 has 80 divisors (see below), whose sum is σ = 1851631488. Its totient is φ = 204784128.

The previous prime is 647068217. The next prime is 647068241. The reversal of 647068240 is 42860746.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 647068240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647068241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37162 + ... + 51721.

Almost surely, 2^647068240 is an apocalyptic number.

It is an amenable number.

647068240 is an abundant number, since it is smaller than the sum of its proper divisors (1204563248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647068240 is a wasteful number, since it uses less digits than its factorization.

647068240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88916 (or 88910 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 647068240 is about 25437.5360442005. The cubic root of 647068240 is about 864.9347807421.

The spelling of 647068240 in words is "six hundred forty-seven million, sixty-eight thousand, two hundred forty".